A HELPING HAND FOR YOUR MACHINE TOOL
LUNIS. FROM RÖHM.
LUNIS
322
WHERE?Automatically clamping, horizontal and vertical
turning machines
FOR WHAT?Support of long, slim turned parts for the
highest accuracy up to 5 microns during turning
WHY? Modular system allows numerous combinations
Sealed housing as standard1
Standard connection for sealing air
HOW MUCH? Excellent price/performance ratio
Low air consumption due to sealing
The Lunis is a self-centering, hydraulically actua-
ted steady rest. It is mainly used on CNC turning
machines for supporting long, slim turned parts
during machining. It enables concentricity and form
tolerances of max. 5 µm to be maintained.
Even in the basic version (from size 08-105),
the Lunis is sealed as standard.
For tight installation spaces, there is the Lunis-B
version with a side-mounted cylinder.
If required, compressed air can be used to prevent
contamination from chips, coolant or debris. In the
LUNIS-SC, coolant replaces compressed air for
this function. Optional chip guards are available
upon request to avoid scratching the surface of
the workpiece.
The Lunis replaces the Röhm steady rests from the
SLZN and SLZNB series. The name "Lunis" comes
from Latin (lat: Luna = moon) and refers to the
figure of the crescent-shaped clamping arms.
MAX. DEVIATION OF 5 µ
For supporting long, slim turned parts
to provide the highest accuracy
THE LUNIS IS PERFECTLY POISED
Lunis steady rest
Clamping device
Workpiece
Basic version from size 08-105 1
LUNIS
54
Cylindrical or spherical rollers
To keep the friction of the rotating workpiece as low
as possible during machining, the clamping force
is applied at the end of the clamping arms via pres-
sure rollers. The rollers have radial and axial roller
bearings. For optimum contact with the workpiece,
they are cylindrically shaped (RZ) and are manufac-
tured with the highest concentricity precision.
For special clamping situations, the rollers are
optionally available in a spherical design (RB). This
shape prevents tilting when moving the steady
rest. It can also be used for create slightly conical
geometries.
Special versions, such as plastic rollers,
for example, are available from us on request.
Option: Eccentric roller adjustment for
fine adjustment of the concentricity
without moving the steady rest body
The achievable precision when working with a stea-
dy rest depends to a large extent on its exact posi-
tion. Here it is crucial that the clamping arms clamp
precisely to the axis of rotation of the workpiece.
Fine adjustment of the clamping direction towards
the axis of rotation can be made via the optional
roller adjustment. In doing so, the rotation axes of
the rollers are slightly shifted and thus enable perfect
alignment.
Features a sealing-air connection,
and sealed as standard
Sealing parts that move against each other is always a
challenge for designers. Especially with a steady rest,
because there are not only moving clamping arms here
but also the tightest tolerances are required to
guarantee high accuracies. The Lunis can therefore
always be pressurized with sealing air. Overpressure
inside the steady rest ensures that no particles or foreign
bodies can penetrate. To keep air consumption as low
as possible, all versions (from size 08-105) are sealed;
this is easily recognizable by the designation Lunis-S
(S=sealed).
To further minimize the sealing air, the air consumption is
automatically reduced when the steady rest is fully open.
In addition, the pressurized of the steady rest can be
used to clean the center roller bearing.
WHEN CHALK WON‘T HELP
FOR THE PERFECT LINE
Lunis steady rests are sealed as standard, which saves expen-sive compressed air. Compa-rison: The air consumption [l/min] of a non-sealed steady rest (blue) and a sealed steady rest (orange), as a function of the pressure [bar].
Optional eccentric fine adjustment, right in the Lunis SC (with cooling water pressurization, SC=sealed, coolant)
ba r
l/m
in
CLEAN ROUTINE, GREAT BREATHING TECHNIQUE
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LUNIS
76
Hydraulic cylinder in two designs
Installation space is precious. This also applies to the space in machine tools.
That is why the Lunis is available in two variants. Mostly, Lunis steady rests are
used with a hydraulic cylinder mounted on the back. The steady rest is then,
slimmer and the useful travelling distance on the carriage is greater. Alternatively,
there is the Lunis-B with a side-mounted cylinder. This makes the steady rest
shorter toward the rear and particularly suitable for use in confined spaces at the rear.
DISMOUNT TO THE SIDE OR REAR
Lunis-B with side-mounted cylinder
Lunis with rear-mounted cylinder
Lunis-SC with optional coolant supply
Optional coolant supply in the
arms for cooling, flushing and
cleaning of the rollers on the
machining surface For optimal cooling at the clamping points, the
steady rests in the Lunis SC version can optionally
be equipped with a coolant supply (SC = sealed
and coolant). Coolant or air is fed through the arms
of the steady rest directly to the clamping point.
From size 30-250 onward, the coolant or air can
also be fed through the center arm in addition to
the side arms (it has a separate connection,
so the air or coolant can be controlled individually).
Our designers have asked themselves how
flushing can be optimally applied to the workpiece.
Modern shower heads were the inspiration for
the design of the outlet plates. They ensure the
widest possible, most uniform showering. Like a
good shower head, they can be moved and
adjusted to the diameter of the workpiece to be
supported.
In addition to optimal coolant guidance, the outlet
plates also serve as a chip guard and prevent
chips from getting under the rollers, thus impairing
the concentricity and surface quality.
KEEP YOUR COOL
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LUNIS
98
Optional chip guard prevents
chips from being drawn in.
Rotating components on machine tools tend to
draw in chips. Here, they end up between the roller
and the workpiece. To prevent this, there is an
optional chip guard (SS). It is positioned in front of
the rollers in such a way that no chips can enter.
The chip guards can be bolted in place to prevent
damaging very sensitive surfaces.
If the steady rest is equipped with the optional
coolant feed-through (SC), no additional chip guard
is required. In this case, the outlet plate also acts
as a chip guard to guide the coolant or air in a
targeted manner.
MINIMIZE THE RISK OF INJURY
Reliable clamping in the event
of loss of pressure
All2 versions of the Lunis steady rests have a pressure
retaining valve integrated into the cylinder. In the event
of a sudden pressure drop in the supply line, it ensures
that the pressure in the cylinder is maintained, thereby
preventing the steady rest from opening. This feature
can also be omitted in the case of concurrent machining
operations. In this case, an equivalent safety device must
be installed instead.
Standard: machine lubrication
Optional: manual
To lubricate the steady rests, they are—as a rule, and if
available—connected to the central lubrication system of
the machine. Only one connection is required for this.
The metering units for the rollers are integrated into the
steady rest body and ensure sufficient lubrication at time
intervals (2-5 minutes, depending on the load, at 16-50 bar).
If automatic lubrication is not possible or not desired,
upon request, an option for manual lubrication via a
grease nipple or grease gun is available.
ALWAYS A TIGHT GRIP
OPTIONS FOR STAYING FLEXIBLE
Due to the small size, the pressure maintaining valve is optional on size 04-70 and is fitted externally.
2
Optional chip guard (SS)
On the Lunis SC variant, the chip guard is integrated: The outlet plate assumes the function.
OP
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LUNIS
1110
Optional position and position
indicator for determining the
clamping arm position
To check on the machine side whether the
steady rest is in the fully open position, an
optional proximity switch is available.
If the exact position of the clamping arms is
to be measured on the machine side, the Lunis3
can optionally be equipped with the inductive
position indicator F90.
If you would like to use other position indicators or
systems than the F90, the flexible Lunis modular
system makes this possible.
Important for the smallest size 04-70: The optional
travel measuring system is only available when
preinstalled; retrofitting is not possible due to the
small design.
TAKE TOP POSITION
Optional proximity switch for detecting the
open position
Optional sensor for customer-specific
proximity switches for registering the open
position (not included in the scope of delivery)
The F90 position indicating system is for the exact determination of the position of the clamping arms. It is attached to the outside of the Lunis and picks up the position of the encoder. (IO link sensors on request)
This option is not available for the Lunis with a side-mounted cylinder (Lunis-B) 3
OP
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LUNIS
1312
For the production of very precise geometries with minimal
concentricity and/or form tolerances, long, slim parts are
additionally supported. Such workpieces could be uninten-
tionally deformed by the cutting forces during machining.
The steady rest absorbs these cutting forces and prevents
deformation of the component. To ensure that the support
is provided as for example as possible at the point of the cutting
forces, the steady rest travels along with the machining tool
on a steady rest carriage.
If your machine tool does not have a steady
rest carriage, the steady rest can also be
used stationary—in this case as additional,
fixed support. However, since the distance
of the machining tool changes towards the
steady rest during machining, the cutting
forces cannot be absorbed evenly. Defor-
mation of the workpiece can not usually be
completely prevented with the fixed support.
It is, however, much reduced by using a
steady rest than without.
Steady rests are also used when it is not possible to support
projecting workpieces on the opposite side by means of a live
center, for example because the end face has to be machined.
Then, the steady rest takes over the support at the end of the
workpiece, and the end face is freely accessible. In this case,
the steady rest carriage is not moved. This type of clamping can
also be helpful before the actual machining in order to set the
centering hole for the center.
Traveling support
Fixed support
Machining on the face
THREE CLASSIC ROUTINES
1515
LUNIS
14
Install the Lunis with just four screws
Steady rests—whether travelling or fixed—absorb the cutting
forces during machining and improve the result. Machine tools
are equipped with a separate steady rest carriage. The Lunis
steady rests are attached to it with four screws and aligned with
the workpiece to be machined. Appropriate connections are
provided for the connection of hydraulics (G1/4", or G3/8" from
30-250), central lubrication (G1/8"), cooling water (G1/8",
or G1/4" from 11-152) and compressed air (G1/8").
INSTALLATION
JUST 4 SCREWS FOR THE PERFECT 10
1717
LUNIS
16
TECHNOLOGY
Piston (inside)
Cam segment (inside)
Return lever (inside)
Clamping arm, outside
Optional chip guard
Clamping arm, center
Scraper bar
Optional eccentric adjustment
Rollers
Mounting holes
Compressed air connection G1/8"
Safety valve
Connection for central lubrication
Hydraulic connection (opening)
Hydraulic connection (closing)
Metering cartridges (with manual lubrication option, grease nipple)
1
2
3
4
6
7
8
9
11
12
13
14
15
16
10
15
16
5
13
14
12
10
11
9
You can find more information on
the Lunis on our website:
ROEHM.BIZ/LUNIS
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3
1
8
5
6
7
4
The design of the Lunis
THE PERFECT INTERPLAY
1919
LUNIS
18
TECHNOLOGY
A steady rest is an additional center support
for clamping at the ends (a clamping device on
the spindle side and a center on the vice side).
As the steady rest is located in the middle of
the machining area of the machine, its clamping
arms (4) must be guided as closely as possible to
the workpiece. At the same time, remove these
words, it is necessary that the forces of the side
clamping arms as well as the central clamping
arm (6) act exactly on the axis of rotation of the
workpiece. That way, the clamping forces cancel
each other out in the central point, and the
workpiece is exactly centerd. Ideally, the clamping
forces are equal and offset by 120° to each other.
The steady rest side arms swing and their points
of contact with the workpiece move on a circular
path and will vary depending on the workpiece
diameter. Different workpiece diameters therefore
require a realignment of the steady rest. The cen-
ter steady rest arm moves linearly and therefore
always acts on the center of the workpiece.
The side steady rest arms, as well as the middle
steady rest arm, are connected inside via a control
contour with the left and right return levers (3). When
the cylinder is pressurised via the hydraulic supply
(closing) (15), the piston (1) moves the return lever
and the steady rest closes. When the hydraulic inlet
(opening) (16) is pressurised, the piston of the cylin-
der pulls back the return lever, and the steady rest
opens.
For fine adjustment of the steady rest (see above:
alignment of the roller rotation center line via the outer
tension rollers for for exact concentricity) there is the
optional eccentric adjustment (9). This can be used
to adjust the rotation axis of the rollers (8).
Here the workpiece diameter is smaller, therefore the steady rest clamps too far up. It must be set lower.
The side steady rest arms move on a circular path during adjustment. To ensure that the contact point of the rollers with the workpiece contour is on the direction of force, the steady rest must be adjusted to match the diameter in question.
Correctly clamped, the clamping forces of the steady rest arms cancel each other out in the center of the workpiece.
120°120°
120°
FClamping arm, left
FClamping arm, left + Fclamping arm, right + Fclamping arm, center = 0
FClamping arm, right
FClamping arm, center
120°120°
120°
Clamping arm, left
Clamping arm, left
Clamping arm, right
Clamping arm, right
IT‘S ALL ABOUT THE BALANCE OF FORCES
How the Lunis works
2121
LUNIS
20 21
Coolant feed-through
Chip guard RollersEccentric fine adjustment
Proximity switch (in open position)
F90 position indicator 04-70 06-75 08-105 11-152 15-170 40-200 30-250 50-315 85-350 125-460
Min. diameter 30 85 125
Max. diameter 315 350 460
Length (dimension A) 206 214 277 428 436 455 603 696,5 716,5 953,5
Width (dimension K) 54 63 75 90 90 90 110 145 145 175
Height (dimension H) 132 160 190 290 290 290 400 440 440 680
Dimension C 51 52 70 115 123 138 146 178 198 215
Dimension E 60 66 85 135 135 135 240 270 270 330
Dimension F 118 140 170 262 262 262 365 400 400 610/640
Dimension G Ø 11 11 14 18 18 18 23 23 23 27
No No Cylindrical Order separately Order separately Order separately Lunis-RZ 685751 1685569 ---- ---- ---- ---- ---- ---- ---- ----
No No Spherical Order separately Order separately Order separately Lunis-RB ---- 1685570 ---- ---- ---- ---- ---- ---- ---- ----
No Yes Cylindrical Order separately Order separately Order separately Lunis-RZ-SS 685753 1685567 ---- ---- ---- ---- ---- ---- ---- ----
No Yes Spherical Order separately Order separately Order separately Lunis-RB-SS ---- 1685568 ---- ---- ---- ---- ---- ---- ---- ----
No No Cylindrical Order separately Order separately Order separately Lunis-S-RZ ---- ---- 1686195 1686207 1686219 1686231 1686243 1686255 1686267 1686371
No No Spherical Order separately Order separately Order separately Lunis-S-RB ---- ---- 1686196 1686208 1686220 1686232 1686244 1686256 1686268 1686372
No Yes Cylindrical Order separately Order separately Order separately Lunis-S-RZ-SS ---- ---- 1686193 1686205 1686217 1686229 1686241 1686253 1686265 1686369
No Yes Spherical Order separately Order separately Order separately Lunis-S-RB-SS ---- ---- 1686194 1686206 1686218 1686230 1686242 1686254 1686266 1686370
Yes Included Cylindrical Order separately Order separately Order separately Lunis-SC-RZ ---- ---- 1686197 1686209 1686221 1686233 1686245 1686257 1686269 1686373
Yes Included Spherical Order separately Order separately Order separately Lunis-SC-RB ---- ---- 1686198 1686210 1686222 1686234 1686246 1686258 1686270 1686374
OPTIONS
All variants All variants Cylindrical Yes - - ---- ---- 1837851 1837921 1837921 1837921 1837829 1837804 1837804 1838302
All variants All variants Spherical Yes - - ---- ---- 1837853 1837922 1837922 1837922 1837828 1837806 1837806 1838301
All variants All variants independent - Yes - ---- 1838056 1838057 1838058 1838058 1838058 1838059 1838060 1838060 1838060
All variants All variants independent - - Yes ---- 1838338 1838341 1838344 1838344 1838344 1838353 1838356 1838359 1838362
INFORMATION ON ORDERING:
The options eccentric fine adjustment, position indicator F90, and proximity
switch must each be ordered in addition to the Lunis. This means that you
must order an additional item number for each option.
ACCESSORIES: CONNECTION CABLE FOR STROKE MONITORING Proximity switch F90 position indicator
Angled plug, 5 m 792178 1145115
Straight plug, 5 m 876342 1008090
THE LUNIS IN NUMBERS Dimensions and order numbers
VERSIONS WITH REAR-MOUNTED HYDRAULIC CYLINDER
* Data without chip protection
2323
LUNIS
22 23
CAD data for the Linus
can be found at
www.roehm.biz/Lunis
Coolant feed-through
Chip guard RollersEccentric fine adjustment
Proximity switch (in open position)
F90 position indicator 08-105 11-152 15-170 40-200 30-250 50-315 85-350 125-460
Min. diameter 8 11 15 40 30 30 85 125
Max. diameter 105 152 170 200 250 315 350 460
Length (dimension A) 228 341 349 368 483,5 574 594 780
Width (dimension K) 75 90 90 90 110 145 145 175
Height (dimension H) 62 100 100 100 119 114 114 185
Dimension C 190 290 290 290 400 440 440 680
Dimension E 70 115 123 138 146 178 198 215
Dimension F 85 135 135 135 240 270 270 330
Dimension G Ø 170 262 262 262 365 400 400 610/640
Maß G Ø 14 18 18 18 23 23 23 27
No No Cylindrical Order separately Order separately - Lunis-B-S-RZ 1686201 1686213 1686225 1686237 1686249 1686261 1686273 1686377
No No Spherical Order separately Order separately - Lunis-B-S-RB 1686202 1686214 1686226 1686238 1686250 1686262 1686274 1686378
No Yes Cylindrical Order separately Order separately - Lunis-B-S-RZ-SS 1686199 1686211 1686223 1686235 1686247 1686259 1686271 1686375
No Yes Spherical Order separately Order separately - Lunis-B-S-RB-SS 1686200 1686212 1686224 1686236 1686248 1686260 1686272 1686376
Yes enthalten Cylindrical Order separately Order separately - Lunis-B-SC-RZ 1686203 1686215 1686227 1686239 1686251 1686263 1686275 1686379
Yes enthalten Spherical Order separately Order separately - Lunis-B-SC-RB 1686204 1686216 1686228 1686240 1686252 1686264 1686276 1686380
OPTIONEN
All variants All variants Cylindrical Yes - - 1837851 1837921 1837921 1837921 1837829 1837804 1837804 1838302
All variants All variants Spherical Yes - - 1837853 1837922 1837922 1837922 1837828 1837806 1837806 1838301
All variants All variants independent - Yes - 1838057 1838058 1838058 1838058 1838059 1838060 1838060 1838060
ACCESSORIES: CONNECTION CABLE FOR STROKE MONITORING Proximity switch F90 position indicator
Angled plug, 5 m 792178 -
Straight plug, 5 m 876342 -
INFORMATION ON ORDERING:
The options eccentric fine adjustment, position indicator F90, and proximity switch
must each be ordered in addition to the Lunis-B. This means that you must order
an additional item number for each option.
VERSIONS WITH SIDE-MOUNTED HYDAULIC CYLINDER
THE LUNIS-B IN NUMBERS Dimensions and order numbers
* Data without chip protection
2525
LUNIS
2424 2525
04-70
06-75
08-105
11-152
15 -170
40-200
30-250
50-315
85-350
125-460
A
H
K b
H
A K
C E
F
C E
F
ØG
ØG
EXPLANATION
LUNIS
2726
1
2
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5
You can conveniently buy clamping and gripping technology from Röhm in our online shop 24/7
eshop247.roehm.biz
The steady rests of the Lunis series are an essential element for clamping on
your machine tool. But precise clamping requires even more components.
We have the complete system for this.
YOU NEED THE WHOLE SYSTEM ...
1
2
3
4
5
… to center long turned parts on the opposite side.
There are live centers from Röhm for this.
... for automated manufacturing. Röhm also offers an
extensive selection of grippers and swiveling devices
for assembly and loading robots.
… to automatically clamp power chucks.
Röhm offershydraulic clamping cylinders with
and without through-holes for this.
… to be able to clamp at all. Röhm has matching,
force-actuated clamping devices for this.
… to clamp workpieces correctly. Röhm offers
an extensive range of top jaws for this.
LUNIS
2928
Do you have a specific project requirement that isn‘t
covered by the wide Lunis range? Röhm can help
you with that too.
We are known worldwide for our customized solutions
for a wide range of industries. This ranges from minor
modification modification of a standard product right up to
a complete redesign of an integrated clamping system.
On the page opposite, we would like to present a project
concerning the special connection for a steady rest steady
rest as an example.
"A steady rest has to be
installed on the machine!"
Wesa GmbH in Waldstetten specializes in
CNC complete machining. As a pure service
provider, the company focuses on metal
processing and employs around 50 people.
Typical orders include the production of
ready-to-install pinions and gear shafts.
Wesa´s machine portfolio has long included
a CNC turning machine for manufacturing
long, thin components. These are workpie-
ces that are usually supported with a steady
rest to be able to machine them with high
precision.
Originally, no steady rest was provided in the
turning center of the CNC turning machine.
There was no hydraulic connection on the
machine. And the turret also dictated the
installation interfaces: a standardized VDI
shaft for holding the steady rest and a
connection hole for the coolant. The frame-
work conditions of the order for Röhm were
clearly defined: a small tool turret, limited
working space and no hydraulic connection.
The Wesa production manager said at the
time: „Those are the specifications! A steady
rest has to be installed on the machine!
Get on with it! And 18 to 36 mm had to
be adhered to as the clamping range.
PRACTICAL TIP
How do you control a
steady rest without a
hydraulic connection?
It is common for a standard tool turret to
have two oil hydraulic connections. But, be-
cause Wesa did not want to install another
medium in the machine, the idea matured to
use the coolant and the existing line for this
purpose to trigger the control commands:
The steady rest is closed by coolant pres-
sure and opened again by spring force.
The solution on the machine: The CNC cont-
roller moves the open steady rest to position,
followed by the signal "coolant on". The
clamping arms of the steady rest close and
the workpiece is now securely supported and
ready for the next machining step. The return
spring force then opens the clamping arms of
the steady rest again.
Jointly developed by Röhm and Wesa: Turret steady rest for machines without the option to attach a standard steady rest.
Steady rest in the turret of the turning machine.
THE TURRET STEADY REST An example of best practice engineering at Röhm
LUNIS
3130 31
A HELPING HAND FOR YOUR MACHINE TOOL
RÖHM Products of America, Inc. 2500 Northlake Drive, Suwanee GA 30024 USA
TEL 001 770 963 84 40 [email protected] roehm.biz Id.-
Nr.1
3950
45 /
092
1
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